Enable specifying an author for news items

Also add paragraph spacing to body of the news item.

Author: chreekat

templates/news/tile.html

@@ -13,7 +13,12 @@ <h4 class="text-2xl-4xl font-normal text-right"><small>$category$</small></h4>
         <div class="relative bg-white">
           <div class="py-4 px-6 sm:px-12">
             <h2 class="text-2xl-4xl font-normal">$title$</h2>
-            <p class="mt-8">$body$</p>
+            $if(author)$
+              <div class="text-xl mt-2">
+                $author$
+              </div>
+            $endif$
+            <div class="mt-8 space-y-4">$body$</div>
           </div>
         </div>
       </div>